JPS6139812B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure cooker that heats and cooks food at a pressure higher than atmospheric pressure in a sealed container, and particularly relates to a pressure cooker that indirectly adjusts internal pressure through temperature control.

The first object of the present invention is to set the cooking time to a timer without including the time from the start of cooking until the predetermined temperature (predetermined cooking pressure) is reached, which varies greatly depending on external factors such as the amount of food to be cooked and room temperature. By setting the timer and starting the timer when the temperature rises to a predetermined temperature, the discrepancy between the required cooking time set by the timer and the actual cooking time at the predetermined temperature can be minimized and cooking accuracy can be increased. be. The second purpose is to use an automatic temperature controller to maintain a predetermined temperature to start the timer, thereby eliminating the need for special heat-responsive parts to start the timer when the temperature rises to a predetermined temperature. The aim is to increase the reliability of operation by reducing the number of responsive parts.

Each embodiment of the present invention shown in the drawings will be described in detail below.

First, in the embodiment shown in FIG. 1, reference numeral 1 denotes an automatic temperature controller consisting of a two-contact switching type thermostat that senses temperature changes in the container and switches at a predetermined temperature, and has a movable contact piece a and two contacts. b, c,
The movable contact piece a is switched to the contact b side when the temperature is below a predetermined temperature, and to the contact c side when the temperature is above a predetermined temperature. The operating temperature of this automatic temperature controller 1 can be arbitrarily varied. 2 is a heater for heating the container; 3 is a timer comprising a timer motor 4 and a timer switch 5; the timer switch 5 is closed when a cooking time is set, and is opened when a predetermined time has elapsed after starting. 6 is relay switch 7
A relay coil which together constitutes a self-holding means closes the relay switch 7 when energized.

The heater 2 is connected at one end to both terminals of an AC power source 8 via a contact b and a movable contact a of the automatic temperature controller 1, and at the other end via a timer switch 5. The timer motor 4 has one end connected to an AC power source 8 through a contact c and a movable contact a of the automatic temperature controller 1, and the other end through a timer switch 5.
A relay coil 6 is connected to the timer motor 4, and a relay switch 7 is connected in parallel between the contact c and the movable contact a of the automatic temperature regulator 1.

Next, the operation in this embodiment will be explained. Furthermore, the second
The figure shows a temperature characteristic diagram of a pressure cooker.

Now, set the cooking temperature to Ta using the automatic temperature controller 1, and set the cooking time to Ta using the timer 3.
-tb, the movable contact piece is on the contact b side and the timer switch 5 is closed, so that the heater 2 is energized and starts heating the container, that is, cooking the food. At the beginning of this cooking, the contact point c of the automatic temperature controller 1 and the relay switch 7 are open, so the timer motor 4 is in a stopped state.

Then, as the heating by the heater 2 progresses and the temperature of the container, that is, the temperature of the food to be cooked, reaches Ta, the automatic temperature regulator 1 switches the movable contact a to the contact c side and stops energizing the heater 2. The timer motor 4 and relay coil 6 are energized to start the timer 3 and perform timing operation, and the relay switch 7 is activated.
Close. Once the relay switch 7 is closed, the timer motor 4 and the relay coil 6 continue to be energized irrespective of the switching operation of the automatic temperature regulator 1.

On the other hand, when the temperature drops, the automatic temperature regulator 1 resumes heating by connecting the movable contact a to the contact b side and energizing the heater 2. From then on, the switching operation of the automatic temperature regulator 1 switches the temperature to the heater 2. By controlling the energization, the temperature Ta is maintained and cooking progresses.

When the time set by the timer 3 has elapsed and the time tb is reached, the timer switch 5 is closed, thereby cutting off the power to the heater 2, timer motor 4, and relay coil 6. Then, heating cooking by the heater 2 is completed.

FIG. 3 shows another embodiment of the invention.
9 is an automatic temperature regulator that opens at a predetermined temperature or higher;
10 is the first and second relay switch 1 when energized
Relay coils 1 and 12 are both closed, and 13 is a relay coil that opens relay switch 14 when energized. One end of the heater 2 is connected to the power supply 8 via the automatic temperature controller 9 and the other end is connected to the power supply 8 via the timer switch 5.
Relay coil 1 is connected to the series circuit of automatic temperature controller 9 and automatic temperature controller 9.
A series circuit of 0 and relay switch 12 and a series circuit of timer motor 4 and relay switch 11 are connected in parallel, and a relay coil 13 is connected to timer motor 4, and relay coil 10 and relay switch 14 are connected to automatic temperature regulator 9. Each series circuit is connected in parallel.

In an embodiment with such a configuration, at the beginning of cooking, the automatic temperature controller 9 is closed to continuously energize the heater 2, and after reaching a predetermined temperature Ta, the automatic temperature controller 9 is opened and closed to energize the heater 2. The food is heated and cooked by controlling the current supply to maintain the temperature Ta. Then, the timer motor 4 is started by the first closing operation of the automatic temperature controller 9, which causes the relay coil 1 to start.
0 is energized through relay switch 14 and relay switches 11 and 12 are closed, and the subsequent operation of timer motor 4 is performed by energizing relay coil 10 through relay switch 12 and closing relay switches 11 and 12. , 12 are kept closed, regardless of whether the automatic temperature regulator 9 is opened or closed. In addition, relay switch 14
is closed when the relay coil 13 is energized by closing the relay switch 11. Of course, the heating cooking by the heater 2 is ended by opening the timer switch 5.

In the embodiment shown in FIG. 4, 15 is an automatic temperature regulator that closes at a predetermined temperature or higher, 16 is a relay coil that closes relay switch 17 when energized, and 18
shows a relay coil that switches the movable contact piece d of the relay switch 19 from the contact e side to the contact f side when energized. Thus, the series circuit of the heater 2 and the movable contact piece d of the relay switch 19 and the contact e, the series circuit of the automatic temperature regulator 15 and the relay coil 18, and the series circuit of the timer motor 4 and the relay switch 17 are connected in parallel with each other. After connection, it is connected to a power source 8 via a timer switch 5, and a relay coil 16 is connected to the timer motor 4, and a movable contact piece d and a contact point f of a relay switch 19 are connected to the relay switch 17 in parallel. .

In an embodiment with such a configuration, the heater 2 is continuously energized via the relay switch 19 at the beginning of cooking, and after reaching a predetermined temperature Ta, the relay coil 18 is energized by the opening/closing operation of the automatic temperature controller 15. By controlling the energization and switching the relay switch 19, the energization to the heater 2 is controlled to maintain a predetermined temperature Ta, and the food is cooked.
Then, the timer motor 4 is started by the first closing operation of the automatic temperature controller 15, which causes the relay coil 1 to start.
8 is energized and the movable contact piece d of the relay switch 19 is switched to the contact f side, so that the relay coil 16
The subsequent operation of the timer motor 4 is performed simultaneously with the energization of the automatic temperature regulator 15 by self-maintaining the relay switch 17 closed by the relay coil 16 energized via the relay switch 17. This continues regardless of whether the relay switch 19 is opened or closed, that is, whether the relay switch 19 is switched. The heating cooking by the heater 2 is completed by opening the timer switch 5, as in the above embodiment.

The embodiments shown in FIGS. 5, 6, and 7 are shown in FIG.
A timer-based irregularity display function is added to each of the embodiments shown in FIGS. 3 and 4. Generally speaking, when using a pressure cooker, the food to be cooked is heated to 100% by heating.
Because it is cooked at a high temperature of over 30 degrees,
Even after the heating by the heater is finished, the pressure remains high and there is sufficient heat for a while, and this allows the cooking to proceed. However, in the embodiments shown in FIGS. 5, 6, and 7, the heating time is maintained for a while after the heater finishes heating (generally until the temperature of the food drops to about 100 degrees). (For example, until time tc in Figure 2), by displaying and making the user aware that smearing is in progress, wasteful release of heat due to opening the lid and gushing out of contents during smearing can be prevented. This is something that can be prevented.

That is, the timer is provided with two timer switches, the first timer switch is closed when a predetermined time elapses after the timer motor starts (when time tb is reached in Fig. 2), and the second timer switch is closed when the timer motor is started. The timer switch is configured to open when a certain period of time has elapsed after the timer switch No. 1 is opened (when time tc is reached in Figure 2), and the connection positions of the first and second timer switches are as follows. .

The embodiment shown in FIG. 5 is the embodiment shown in FIG.
A timer switch 5' and a second timer switch 5'' are inserted in series, and one end of each of the timer motor 4 and relay coil 6 is connected to one terminal of the power source 8 through the second timer switch 5''. do. The embodiment shown in FIG. 6 is a variation display function added to the embodiment shown in FIG. In addition, one end of each of the timer motor 4 and the relay switch 12 is connected to one terminal of the power source 8 through the second timer switch 5''. The embodiment shown in Fig. 7 is the embodiment shown in Fig. 4 with an unevenness display function added.
The first and second timer switches 5' and 5'' are inserted in series at one end of the relay coil 18, and the second timer switch 5'' is inserted at one end of each of the timer motor 4 and the relay coil 16. and connect them to one terminal of the power supply 8, respectively.

Therefore, in any of these embodiments, the first
Heater 2 is activated by opening timer switch 5'.
However, the operation of the timer motor 4 is controlled by the second timer switch 5''.
It is connected when the timer motor 4 is closed, and is stopped when the second timer switch 5'' is opened when the tc time reaches the tc time. By attaching a message that says ``Dressing'', the user can easily recognize that the screen is sloping. It is assumed that the closing time of the timer 3 as well as the first timer switch 5', that is, the cooking time by the heater 2 can be arbitrarily varied.

As the unevenness display means, it is also possible to use a lamp that is turned on when the first timer switch 5' is opened and turned off when the second timer switch 5'' is opened.

As described above, the pressure cooker of the present invention uses a timer to set the cooking time without including the time from the start of cooking until the predetermined cooking temperature is reached, which varies greatly depending on external factors, and sets the timer to the predetermined cooking temperature. Since it starts when the temperature rises, it is possible to minimize the discrepancy between the required cooking time set by the timer and the actual cooking time at the specified cooking temperature (prescribed cooking pressure), increasing cooking accuracy. Since the temperature and the timer starting temperature are the same, there is no need to set the timer starting temperature separately from the cooking temperature and build a control circuit based on this, or to install dedicated heat-responsive parts. Simplification can be achieved and operational reliability can also be improved.

Furthermore, by using a timer to display irregularities, residual heat can be used effectively, resulting in even better results.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram showing one embodiment of the pressure cooker of the present invention, Fig. 2 is a temperature characteristic diagram of the food to be cooked in the pressure cooker, and Figs. FIG. 3 is an electrical circuit diagram showing different embodiments of the invention. 1: automatic temperature controller, 2: heater, 3: timer, 6: relay coil, 7: relay switch,
9: Automatic temperature controller, 10: Relay coil, 1
1, 12: Relay switch, 15: Automatic temperature controller, 16: Relay coil, 17: Relay switch, 18: Relay coil, 19: Relay switch.

Claims (1)

[Scope of Claims] 1. A pressure cooker that heats cooking with a sealed container, including a heater that heats the container, a timer that cuts off electricity to the heater after a predetermined time has elapsed after startup, and a pressure cooker that controls the temperature of the container. An automatic temperature regulator that operates by sensing a change and maintains a predetermined cooking temperature by controlling energization to the heater in accordance with the operation; 1. A pressure cooker comprising a relay that starts a timer and enters a self-holding state, and the self-holding causes the timer to continue operating independently of the operation of an automatic temperature regulator. 2. In a pressure cooker that cooks with a sealed container, there is a heater that heats the container, and a heater that shuts off electricity to the heater after a predetermined period of time has passed after starting, and then continues to operate for a certain period of time after cutting off electricity to the heater. A timer that continues, an unevenness display means that displays unevenness as the timer operates after cutting off electricity to the heater, and an unevenness display means that operates by sensing a temperature change in the container and turns on electricity to the heater in accordance with the operation. An automatic temperature controller that maintains a predetermined cooking temperature by controlling the temperature controller, and when the first heater of the temperature controller is de-energized, the timer is started and becomes a self-holding state, and the self-holding causes the timer to operate. A pressure cooker characterized in that it is equipped with a relay that allows the temperature to continue regardless of the operation of an automatic temperature controller.